如果不需要,防止CollapsingToolbarLayout崩溃

Question

使用:

compile 'com.android.support:design:23.0.0'
compile 'com.android.support:appcompat-v7:23.0.0'
compile 'com.android.support:cardview-v7:23.0.0'
compile 'com.android.support:recyclerview-v7:23.0.0'

随着Cheesesquare项目的更新.

进入奶酪的细节,我删除2张牌(只有一张).有没有办法防止显示空白空间的工具栏折叠？

Answer 1

要在Cheesesquare示例中实现此类行为,只需android:layout_height将NestedScrollView的param 修改为wrap_content.如果内容足够小以适应屏幕,它将阻止按内容滚动.

要防止滚动,CollapsingToolbarLayout您应该以编程方式将layout_scrollFlags参数设置为AppBarLayout.LayoutParams.SCROLL_FLAG_SNAP值.

这里描述了如何做到这一点.

Answer 2

您可以使用以下代码：

   public static void stopScroll() {
    AppBarLayout.LayoutParams toolbarLayoutParams = (AppBarLayout.LayoutParams) collapsing_toolbar.getLayoutParams();
    toolbarLayoutParams.setScrollFlags(0);
    collapsing_toolbar.setLayoutParams(toolbarLayoutParams);

    CoordinatorLayout.LayoutParams appBarLayoutParams = (CoordinatorLayout.LayoutParams) appbar.getLayoutParams();
    appBarLayoutParams.setBehavior(null);
    appbar.setLayoutParams(appBarLayoutParams);
}

public static void startScroll() {
    AppBarLayout.LayoutParams toolbarLayoutParams = (AppBarLayout.LayoutParams) collapsing_toolbar.getLayoutParams();
    toolbarLayoutParams.setScrollFlags(AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL | AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS);
    collapsing_toolbar.setLayoutParams(toolbarLayoutParams);

    CoordinatorLayout.LayoutParams appBarLayoutParams = (CoordinatorLayout.LayoutParams) appbar.getLayoutParams();
    appBarLayoutParams.setBehavior(new AppBarLayout.Behavior());
    appbar.setLayoutParams(appBarLayoutParams);
}